1. blocking entrance to and exit from seaports and harbors
; - Example: "the blockading ships prevented delivery of munitions"
The Collaborative International Dictionary of English v.0.48:
Blockade \Block*ade"\, v. t. [imp. & p. p. Blockaded; p. pr. &
vb. n. Blockading.]
1. To shut up, as a town or fortress, by investing it with
troops or vessels or war for the purpose of preventing
ingress or egress, or the introduction of supplies. See
note under Blockade, n. "Blockaded the place by sea."
2. Hence, to shut in so as to prevent egress.
Till storm and driving ice blockade him there.
3. To obstruct entrance to or egress from.
Huge bales of British cloth blockade the door.
WordNet (r) 3.0 (2006):
adj 1: blocking entrance to and exit from seaports and harbors;
"the blockading ships prevented delivery of munitions"